#include<bits/stdc++.h>
#define endl '\n'
#define debug(x) cerr<<#x<<':'<<x<<endl
#define IOS ios::sync_with_stdio(0),cin.tie(0),cout.tie(0)
using namespace std;
signed main(){
    // freopen(".in","r",stdin);
    // freopen(".out","w",stdout);
    return 0;
}